JPH05297305A - Deflecting and scanning device - Google Patents

Abstract

PURPOSE:To provide the deflecting and scanning device which does not generate a large noise even if the center part of a lid vibrates. CONSTITUTION:The deflecting and scanning device A1 has a rotary polygon mirror 2 which deflects a laser beam L1 and puts it in scanning motion, a motor 3 which drives and rotates the polygon mirror, and 1st and 2nd lenses 4 and 5, and they are stored in a housing 1, whose opening 11 is closed with the detachable lid 6. The 1st and 2nd lenses 4 and 5 are fixed to the support part 16 of the housing 1 and the 1st lens 4 has a lens recessed part 41 at its peak part. A lens holding catch 62 is integrally provided at the center part of the lid 6, and the opening 11 of the housing 1 is closed with the lid 6, whose center part is pressed against the 1st lens 4 to engage the lens holding catch 62 with the lens recessed part 41.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflection scanning device such as a laser beam printer or a laser facsimile, which is capable of preventing noise caused by vibration of a lid of an enclosure that houses a rotating body.

[0002]

2. Description of the Related Art An example of a conventional deflection scanning device will be described with reference to FIGS. As shown in FIG. 6, the semiconductor laser unit S is fixed to the side wall of the casing 101 of the deflection scanning device A ₀ , and the laser beam L _S emitted from the semiconductor laser unit S is generated by the plurality of rotary polygon mirrors 102. The laser beam L ₀ is deflected and scanned by the reflection surface 102 a formed of a mirror surface, and the deflected and scanned laser beam L ₀ is applied to the surface of the photosensitive drum D through the first lens 104 and the second lens 105. Image writing modulation is applied to the semiconductor laser unit S in synchronization with the scanning of the laser beam L ₀ , and the laser beam L ₀ forms an image on the surface of the photosensitive drum D based on this. The start signal of the image writing modulation is obtained by reflecting a part L _P of the laser beam L ₀ by the mirror M and introducing it into the detector N.

As shown in FIG. 7, the rotary polygon mirror 10 is used.
2, the motor 103 for rotating the same, the first and second lenses 104 and 105, the mirror M and the detector N are housed in the casing 101,
Has a window 114 for emitting an opening laser beam toward the photosensitive drum D, and also has an upper opening 111 in the figure of the casing 101.
Is closed by a removable lid 106. The lid 1
Reference numeral 06 denotes an integrally formed thin plate, and a plurality of locking claws 161 are arranged on the outer peripheral edge thereof, and the locking claws 161 are respectively provided on the outer peripheral wall 112 of the housing 101. By engaging the recess 113, the lid 10
6 and the casing 101 are connected.

[0004]

However, according to the above-mentioned conventional technique, the lid is integrally formed by the thin plate as described above, and the lid is engaged with the outer peripheral wall of the housing by the engaging claws of the outer peripheral edge thereof. However, there is a problem to be solved that the central portion of the lid vibrates in the vertical direction in the drawing during the rotation of the rotary polygon mirror, which causes a large amount of noise.

The present invention has been made in view of the above-mentioned unsolved problems of the prior art, and it is possible to prevent the central portion of the lid from generating a large noise due to vibration during rotation of the rotary polygon mirror. It is an object of the present invention to provide a deflection scanning device that can be used.

[0006]

In order to achieve the above object, the apparatus of the present invention comprises a rotary polygon mirror for deflecting and scanning illumination light and at least one lens arranged in the optical path of the illumination light. A deflection scanning device having a housing for accommodating them and a detachable lid for closing an opening of the housing, wherein the lens is fixed to the housing, and a central portion of the lid is provided. A coupling means for detachably coupling to the lens is provided.

[0007]

[Operation] While closing the opening of the enclosure with the lid,
The central portion of the lid can be fixed to the housing by connecting the lens to the lens.

[0008]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic cross-sectional view showing a first embodiment. A deflection scanning device A ₁ of this embodiment has an opening 1 at the top of the drawing.
1 has an enclosure 1 having a rotary polygon mirror 2 therein.
A motor 3 for rotationally driving the same, a semiconductor laser unit for irradiating a laser beam toward the rotary polygon mirror 2 and its lens system (neither shown), and a laser beam L ₁ deflected and scanned by the rotary polygon mirror 2. A first lens 4 and a second lens 5, which are lenses arranged in series with each other in the optical path, are accommodated, and the opening 11 is closed by a lid 6. The lid 6 has a plurality of locking claws 61 integrally provided on the outer peripheral edge thereof, and each locking claw 61 is engaged with a recess 13 formed in the outer peripheral wall 12 of the housing 1. By doing so, the housing 1 is locked. The laser beam L ₁ passes through the first and second lenses 4 and 5 and is irradiated onto the photosensitive drum (not shown) from the window 14 of the casing 1.

The respective bases of the first and second lenses 4 and 5 are fixed to a support portion 16 which is integrally provided on the bottom wall 15 of the housing 1, and is located near the center of the housing 1. The first lens 4 has a lens recess 41, which is a recess at the upper end in the figure, while the lid 6 is integrally provided with a lens locking claw 62, which is a locking claw, in the center thereof. When the central portion of the lid 6 is pressed from above in the drawing toward the first lens 4, the lens locking claw 62 is provided with the lens recess 41.
Is formed to slide into.

The lid 6 is attached by engaging the respective locking claws 61 on the outer peripheral edge of the lid 6 with the recesses 13 of the enclosure 1 to connect the outer peripheral edge of the lid 6 to the enclosure 1. This is performed by pressing the central portion of 6 downward in the drawing, sliding the lens locking claw 62 into the lens recess 41, and coupling the lens locking claw 62 to the first lens 4.

When the central portion of the lid 6 is coupled to the first lens 4 in this manner, the first lens 4 is fixed to the supporting portion 16 which is integral with the housing 1, so that the rotary polygon mirror 2
The central portion of the lid 6 does not vibrate significantly during the rotation of the. Therefore, no large noise is generated by the vibration of the lid 6. When the first lens is made of a plastic material, the lens recess can be formed when molding the first lens. When the first lens is made of glass or the like, it is desirable that a member having a lens recess be formed separately from the first lens and that the member be attached to the first lens.

FIG. 2 is a schematic cross-sectional view showing a second embodiment. The deflection scanning device A ₂ of this embodiment is replaced with the first lens 4 having the lens recess 41 of the first embodiment. Then, the first lens 4a having the lens hole 41a which is a hole opened upward in the drawing is provided, and the lid 6a is provided with the lens hole 41a.
A locking pin 62a, which is a pin that can be freely press-fitted into, is integrally provided. In this embodiment, the opening 6a of the casing 1a is closed by the lid 6a, the central portion of the lid 6a is pressed downward in the drawing, and the locking pin 62a is press-fitted into the lens hole 41a. It is fixed to the lens 4a. The locking pin 62a of the present embodiment has the advantage of low manufacturing cost because it is cylindrical and does not require a complicated manufacturing process. Since the other points are the same as those in the first embodiment, description thereof will be omitted.

FIG. 3 is a schematic cross-sectional view showing a third embodiment. The deflection scanning device A ₃ of this embodiment is replaced with the first lens 4 having the lens recess 41 of the first embodiment. Lens locking claw 4 which is a locking claw integrally provided at the upper end of the drawing.
The first lens 4b having 1b is provided, and the lid 6b has
A locking hole 62b, which is a hole into which the lens locking claw 41b can be engaged, is formed. The opening 6b of the enclosure 1b is closed by the lid 6b and the lid 6b is closed.
The central portion of b is pressed downward in the drawing to move the lens locking claw 4
1b is engaged with the locking hole 62b. by this,
The central portion of the lid 6b is locked to the first lens 4b.
This embodiment has an advantage that the lens locking claw 41b can be easily released from the locking hole 62b when the lid 6b is removed from the housing 1b. Since the other points are the same as those in the first embodiment, description thereof will be omitted.

FIG. 4 is a schematic cross-sectional view for explaining the fourth embodiment. The deflection scanning device A ₄ of this embodiment is the same as the first lens 4 having the lens recess 41 of the first embodiment. Instead of
A first lens 4c having a screw hole 41c opening upward in the drawing is provided, and a hole 62c for allowing the screw 7 screwed into the screw hole 41c to pass through is formed in the lid 6c. The lid 6c closes the opening 11c of the housing 1c, and the screw 7 penetrating the hole 62c of the lid 6c is screwed into the screw hole 41c of the first lens 4c. As a result, the central portion of the lid 6c is screwed onto the first lens 4c. This embodiment has the advantage that the central portion of the lid 6c can be firmly joined to the first lens 4c, and the joining can be released easily. A screw rod is previously screwed into the screw hole 41c, and the lid 6
The lid 6c may be screwed to the first lens 4c by screwing a nut onto the portion of the c projecting from the hole 62c.
Since the other points are the same as those in the first embodiment, description thereof will be omitted.

FIG. 5 is a schematic sectional view showing a fifth embodiment. The deflection scanning device A ₅ of the present embodiment is replaced with the first lens 4 having the lens recess 41 of the first embodiment. Then, the first lens 4d having the leaf spring 8 mounted thereon is provided at the upper end of the drawing, the screw hole 41d is provided in the leaf spring 8, and the lid 6d
Is formed with a hole 62d for penetrating the screw 7d screwed into the screw hole 41d. The opening 6d of the enclosure 1d is closed by the lid 6d and the lid 6d is closed.
The screw 7d which penetrates the hole 62d of d is screwed into the screw hole 4 of the leaf spring 8.
Screw to 1d. As a result, the central portion of the lid 6d is screwed onto the first lens 4d. This embodiment has an advantage that the manufacturing cost is low because it is not necessary to process the first lens 4d, and that the lid 6d and the first lens 4d can be easily disconnected. Since the other points are the same as those in the first embodiment, description thereof will be omitted.

[0017]

Since the present invention is configured as described above, it has the following effects.

By fixing the central portion of the lid that closes the opening of the housing to the housing through the lens, it is possible to prevent the central portion of the lid from vibrating and generating a large amount of noise during rotation of the rotary polygon mirror. be able to.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing a first embodiment.

FIG. 2 is a schematic sectional view showing a second embodiment.

FIG. 3 is a schematic cross-sectional view showing a third embodiment.

FIG. 4 is a schematic sectional view showing a fourth embodiment.

FIG. 5 is a schematic cross-sectional view showing a fifth embodiment.

FIG. 6 is a schematic plan view showing a state in which a lid of a conventional example is removed.

7 is a schematic cross-sectional view of the device of FIG.

[Explanation of symbols]

A ₁ , A ₂ , A ₃ , A ₄ , A ₅ Deflection scanning device 1, 1 a, 1 b, 1 c, 1 d Case 2 Rotating polygon mirror 3 Motors 4, 4 a, 4 b, 4 c, 4 d First lens 5 Second Lens 6,6a, 6b, 6c, 6d Lid 41 Lens recess 41a Lens hole 41b Lens locking claw 41c, 41d Screw hole 62 Lens locking claw 62a Locking pin 62b Locking hole 62c, 62d Hole 7,7d Screw 8 leaf spring 15 bottom wall 16 support portion

Claims (6)

[Claims] 1. A rotary polygon mirror for deflecting and scanning illumination light, and at least one lens arranged in an optical path of the illumination light,
A deflection scanning device having a housing for accommodating them and a detachable lid for closing an opening of the housing, wherein the lens is fixed to the housing, the central portion of the lid being the lens. A deflection scanning device, characterized in that it is provided with a coupling means for detachably coupling to the. 2. The coupling means comprises a recess provided in the lens and a locking claw provided in the central portion of the lid and engageable with the recess. Deflection scanning device. 3. The coupling means includes a hole formed in the lens,
2. The deflection scanning device according to claim 1, further comprising a pin provided in a central portion of the lid, the pin being press-fittable into the hole. 4. The coupling means comprises a locking claw integrally formed with the lens and a hole provided in a central portion of the lid and engageable with the locking claw. 2. The deflection scanning device according to 1. 5. The coupling means comprises a screw hole provided in the lens and a screw penetrating through a hole provided in the central portion of the lid and screwed into the screw hole. Deflection scanning device. 6. The coupling means comprises a leaf spring having a screw hole attached to the lens, and a screw penetrating through a hole provided in the central portion of the lid and screwed into the screw hole. The deflection scanning device according to claim 1.